Annotation of qemu/osdep.c, revision 1.1.1.8

1.1       root        1: /*
                      2:  * QEMU low level functions
1.1.1.4   root        3:  *
1.1       root        4:  * Copyright (c) 2003 Fabrice Bellard
1.1.1.4   root        5:  *
1.1       root        6:  * Permission is hereby granted, free of charge, to any person obtaining a copy
                      7:  * of this software and associated documentation files (the "Software"), to deal
                      8:  * in the Software without restriction, including without limitation the rights
                      9:  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
                     10:  * copies of the Software, and to permit persons to whom the Software is
                     11:  * furnished to do so, subject to the following conditions:
                     12:  *
                     13:  * The above copyright notice and this permission notice shall be included in
                     14:  * all copies or substantial portions of the Software.
                     15:  *
                     16:  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
                     17:  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
                     18:  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
                     19:  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
                     20:  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
                     21:  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
                     22:  * THE SOFTWARE.
                     23:  */
                     24: #include <stdlib.h>
                     25: #include <stdio.h>
                     26: #include <stdarg.h>
                     27: #include <string.h>
                     28: #include <errno.h>
                     29: #include <unistd.h>
1.1.1.4   root       30: #include <fcntl.h>
1.1.1.7   root       31: #ifdef CONFIG_SOLARIS
1.1.1.3   root       32: #include <sys/types.h>
                     33: #include <sys/statvfs.h>
                     34: #endif
1.1       root       35: 
1.1.1.7   root       36: /* Needed early for CONFIG_BSD etc. */
1.1.1.6   root       37: #include "config-host.h"
1.1       root       38: 
                     39: #ifdef _WIN32
                     40: #include <windows.h>
1.1.1.7   root       41: #elif defined(CONFIG_BSD)
1.1       root       42: #include <stdlib.h>
                     43: #else
                     44: #include <malloc.h>
                     45: #endif
                     46: 
1.1.1.6   root       47: #include "qemu-common.h"
                     48: #include "sysemu.h"
1.1.1.5   root       49: #include "qemu_socket.h"
1.1       root       50: 
1.1.1.7   root       51: #if !defined(_POSIX_C_SOURCE) || defined(_WIN32) || defined(__sun__)
1.1.1.6   root       52: static void *oom_check(void *ptr)
                     53: {
                     54:     if (ptr == NULL) {
                     55:         abort();
                     56:     }
                     57:     return ptr;
                     58: }
                     59: #endif
                     60: 
1.1       root       61: #if defined(_WIN32)
1.1.1.4   root       62: void *qemu_memalign(size_t alignment, size_t size)
                     63: {
1.1.1.6   root       64:     if (!size) {
                     65:         abort();
                     66:     }
                     67:     return oom_check(VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE));
1.1.1.4   root       68: }
1.1       root       69: 
                     70: void *qemu_vmalloc(size_t size)
                     71: {
                     72:     /* FIXME: this is not exactly optimal solution since VirtualAlloc
                     73:        has 64Kb granularity, but at least it guarantees us that the
                     74:        memory is page aligned. */
1.1.1.6   root       75:     if (!size) {
                     76:         abort();
                     77:     }
                     78:     return oom_check(VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE));
1.1       root       79: }
                     80: 
                     81: void qemu_vfree(void *ptr)
                     82: {
                     83:     VirtualFree(ptr, 0, MEM_RELEASE);
                     84: }
                     85: 
1.1.1.2   root       86: #else
                     87: 
1.1.1.4   root       88: void *qemu_memalign(size_t alignment, size_t size)
                     89: {
1.1.1.7   root       90: #if defined(_POSIX_C_SOURCE) && !defined(__sun__)
1.1.1.4   root       91:     int ret;
                     92:     void *ptr;
                     93:     ret = posix_memalign(&ptr, alignment, size);
                     94:     if (ret != 0)
1.1.1.6   root       95:         abort();
1.1.1.4   root       96:     return ptr;
1.1.1.7   root       97: #elif defined(CONFIG_BSD)
1.1.1.6   root       98:     return oom_check(valloc(size));
1.1.1.4   root       99: #else
1.1.1.6   root      100:     return oom_check(memalign(alignment, size));
1.1.1.4   root      101: #endif
                    102: }
                    103: 
1.1       root      104: /* alloc shared memory pages */
                    105: void *qemu_vmalloc(size_t size)
                    106: {
1.1.1.5   root      107:     return qemu_memalign(getpagesize(), size);
1.1       root      108: }
                    109: 
                    110: void qemu_vfree(void *ptr)
                    111: {
                    112:     free(ptr);
                    113: }
                    114: 
                    115: #endif
                    116: 
1.1.1.4   root      117: int qemu_create_pidfile(const char *filename)
                    118: {
                    119:     char buffer[128];
                    120:     int len;
                    121: #ifndef _WIN32
                    122:     int fd;
                    123: 
1.1.1.7   root      124:     fd = qemu_open(filename, O_RDWR | O_CREAT, 0600);
1.1.1.4   root      125:     if (fd == -1)
                    126:         return -1;
                    127: 
                    128:     if (lockf(fd, F_TLOCK, 0) == -1)
                    129:         return -1;
                    130: 
                    131:     len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
                    132:     if (write(fd, buffer, len) != len)
                    133:         return -1;
                    134: #else
                    135:     HANDLE file;
                    136:     DWORD flags;
                    137:     OVERLAPPED overlap;
                    138:     BOOL ret;
                    139: 
                    140:     /* Open for writing with no sharing. */
                    141:     file = CreateFile(filename, GENERIC_WRITE, 0, NULL,
                    142:                      OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
                    143: 
                    144:     if (file == INVALID_HANDLE_VALUE)
                    145:       return -1;
                    146: 
                    147:     flags = LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY;
                    148:     overlap.hEvent = 0;
                    149:     /* Lock 1 byte. */
                    150:     ret = LockFileEx(file, flags, 0, 0, 1, &overlap);
                    151:     if (ret == 0)
                    152:       return -1;
                    153: 
                    154:     /* Write PID to file. */
                    155:     len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
                    156:     ret = WriteFileEx(file, (LPCVOID)buffer, (DWORD)len,
                    157:                      &overlap, NULL);
                    158:     if (ret == 0)
                    159:       return -1;
                    160: #endif
                    161:     return 0;
                    162: }
                    163: 
                    164: #ifdef _WIN32
                    165: 
                    166: /* Offset between 1/1/1601 and 1/1/1970 in 100 nanosec units */
                    167: #define _W32_FT_OFFSET (116444736000000000ULL)
                    168: 
                    169: int qemu_gettimeofday(qemu_timeval *tp)
                    170: {
                    171:   union {
                    172:     unsigned long long ns100; /*time since 1 Jan 1601 in 100ns units */
                    173:     FILETIME ft;
                    174:   }  _now;
                    175: 
                    176:   if(tp)
                    177:     {
                    178:       GetSystemTimeAsFileTime (&_now.ft);
                    179:       tp->tv_usec=(long)((_now.ns100 / 10ULL) % 1000000ULL );
                    180:       tp->tv_sec= (long)((_now.ns100 - _W32_FT_OFFSET) / 10000000ULL);
                    181:     }
                    182:   /* Always return 0 as per Open Group Base Specifications Issue 6.
                    183:      Do not set errno on error.  */
                    184:   return 0;
                    185: }
                    186: #endif /* _WIN32 */
1.1.1.5   root      187: 
                    188: 
                    189: #ifdef _WIN32
                    190: void socket_set_nonblock(int fd)
                    191: {
                    192:     unsigned long opt = 1;
                    193:     ioctlsocket(fd, FIONBIO, &opt);
                    194: }
                    195: 
                    196: int inet_aton(const char *cp, struct in_addr *ia)
                    197: {
                    198:     uint32_t addr = inet_addr(cp);
                    199:     if (addr == 0xffffffff)
                    200:        return 0;
                    201:     ia->s_addr = addr;
                    202:     return 1;
                    203: }
1.1.1.7   root      204: 
                    205: void qemu_set_cloexec(int fd)
                    206: {
                    207: }
                    208: 
1.1.1.5   root      209: #else
1.1.1.7   root      210: 
1.1.1.5   root      211: void socket_set_nonblock(int fd)
                    212: {
                    213:     int f;
                    214:     f = fcntl(fd, F_GETFL);
                    215:     fcntl(fd, F_SETFL, f | O_NONBLOCK);
                    216: }
1.1.1.7   root      217: 
                    218: void qemu_set_cloexec(int fd)
                    219: {
                    220:     int f;
                    221:     f = fcntl(fd, F_GETFD);
                    222:     fcntl(fd, F_SETFD, f | FD_CLOEXEC);
                    223: }
                    224: 
1.1.1.5   root      225: #endif
1.1.1.7   root      226: 
                    227: /*
                    228:  * Opens a file with FD_CLOEXEC set
                    229:  */
                    230: int qemu_open(const char *name, int flags, ...)
                    231: {
                    232:     int ret;
                    233:     int mode = 0;
                    234: 
                    235:     if (flags & O_CREAT) {
                    236:         va_list ap;
                    237: 
                    238:         va_start(ap, flags);
                    239:         mode = va_arg(ap, int);
                    240:         va_end(ap);
                    241:     }
                    242: 
                    243: #ifdef O_CLOEXEC
                    244:     ret = open(name, flags | O_CLOEXEC, mode);
                    245: #else
                    246:     ret = open(name, flags, mode);
                    247:     if (ret >= 0) {
                    248:         qemu_set_cloexec(ret);
                    249:     }
                    250: #endif
                    251: 
                    252:     return ret;
                    253: }
                    254: 
                    255: #ifndef _WIN32
                    256: /*
                    257:  * Creates a pipe with FD_CLOEXEC set on both file descriptors
                    258:  */
                    259: int qemu_pipe(int pipefd[2])
                    260: {
                    261:     int ret;
                    262: 
                    263: #ifdef CONFIG_PIPE2
                    264:     ret = pipe2(pipefd, O_CLOEXEC);
                    265:     if (ret != -1 || errno != ENOSYS) {
                    266:         return ret;
                    267:     }
                    268: #endif
                    269:     ret = pipe(pipefd);
                    270:     if (ret == 0) {
                    271:         qemu_set_cloexec(pipefd[0]);
                    272:         qemu_set_cloexec(pipefd[1]);
                    273:     }
                    274: 
                    275:     return ret;
                    276: }
                    277: #endif
                    278: 
                    279: /*
                    280:  * Opens a socket with FD_CLOEXEC set
                    281:  */
                    282: int qemu_socket(int domain, int type, int protocol)
                    283: {
                    284:     int ret;
                    285: 
                    286: #ifdef SOCK_CLOEXEC
                    287:     ret = socket(domain, type | SOCK_CLOEXEC, protocol);
                    288:     if (ret != -1 || errno != EINVAL) {
                    289:         return ret;
                    290:     }
                    291: #endif
                    292:     ret = socket(domain, type, protocol);
                    293:     if (ret >= 0) {
                    294:         qemu_set_cloexec(ret);
                    295:     }
                    296: 
                    297:     return ret;
                    298: }
                    299: 
                    300: /*
                    301:  * Accept a connection and set FD_CLOEXEC
                    302:  */
                    303: int qemu_accept(int s, struct sockaddr *addr, socklen_t *addrlen)
                    304: {
                    305:     int ret;
                    306: 
                    307: #ifdef CONFIG_ACCEPT4
                    308:     ret = accept4(s, addr, addrlen, SOCK_CLOEXEC);
1.1.1.8 ! root      309:     if (ret != -1 || errno != ENOSYS) {
1.1.1.7   root      310:         return ret;
                    311:     }
                    312: #endif
                    313:     ret = accept(s, addr, addrlen);
                    314:     if (ret >= 0) {
                    315:         qemu_set_cloexec(ret);
                    316:     }
                    317: 
                    318:     return ret;
                    319: }

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